<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta content="width=device-width, initial-scale=1.0" name="viewport">
    <title>Chatroom</title>
</head>
<body>
<h1>聊天室</h1>
<iframe frameborder="0" height="1000px" src="user.html" width="50%"></iframe>
<iframe frameborder="0" height="1000px" src="user.html" style="float:right;" width="50%"></iframe>
</body>
</html>